Thermostatic cut-off for domestic gas burners



' J. 'AJMALQNEY 1,872,040

THERMOSTKTIC CUT-OFF FOR DOMESTIC GAS BURNERS Aug. 1 1932.

Filed Dec. 11, 1929 31400" to; 13: 7: .MuLo'n a1 @31 Sumo/1 Patented Aug. 16, 1932 JAMES A. MALONEY, OF NEW YORK, N. Y.

THERMOSTATIC CUT-OFF FORDOMES'I'IC GAS BURNERS Application. filed December 11, 1929., Serial ].lo..4%13,246.

My invention relates to means for cutting off automatically the supply of gas from domestic gas burners when the flame s errtinguished, and the object of the invention 1s to provide a mechanism by which the flame at the burner may be varied without interference from the thermostatic cut-0E.

Another object of the invention is to provide a thermostatic cut off in which the thermostatic element is so positioned that the same will recede from the flame as it is eX- panded by the action of the heat.

In the appended drawing forming a part of this application, Figure 1 is a vertical section of a burner on line 11, Figure 2, whlch is provided with a thermostatic cut-01f embodying my invention.

Figure 2 is a bottom plan view.

Figure 3 is a horizontal section on line 33, Figure 4 of the cut-off mechanism, and

Figure 4 is a vertical section on line 4-4, Figure 3.

Referring to the drawing, 5 is a burner to which the supply of gas is controlled bya cock 6. The central aperture 7 of the burner, which is common to the type of domestic burners, accommodates an inverted V shaped thermostatic element 8 with the ends of the V disposed at the bottom of the burner. One of the ends of the V is hinged at9 to the spring housing 10. The frame is being secured to the bottom of the burner by any suitable means, so that the cut-off could be easily attached or detached from the burner. The other end of the V shaped thermostatic element is pivotally connected to one end of a lever 11. the other end. of which is fulcrume'd at 12 in the housing 10. A link 13 has a pivot at one end thereof engaged in a slot 13 provided between the ends of the lever 11, preferably in proximity of the fulcrum 12 of said lever. The other end of the link 13 is pivoted in the housing 10 at 14, the fulcrum 12 of the lever and the pivot 14 of the link being located on opposite sides of the housing 10. The link 13 has a projection or toe 15 which enters an opening 16 in the bottom of the housing 10 and through which it may be projected when the lever 11 moves from the position shown in full line in Figure 1 to that shown in dot and dash line shown in the same figure.

' A spring 17 within the housing 10 has one. end thereof anchored to a ,pin 18, the other end of said spring being anchored to the housing 10.

An arm 19 isjconstrained to revolve with the pin 18 and the desired tension of the spring is obtained by giving thev desired number of revolutions to the pin 18 by the crank 19.

A swivel yoke 20 is mounted in the arm 19 and a rod 21 engages slidably the yoke 20, the rod being pivotally connected to a crank 22 secured to the cock '6 to turn therewith, The rod.21 at the yoke is provided with a threaded nut 23 to permit the adjustment between the arm 19 and the crank 22, the nut 23 .serving as the engaging elements between the yoke 20 and the rod 21. p

When the pet cock is turned to the open position, it carries therewiththe crank 22, rod 21, yoke 20 and the arm 19. See dash and dot line in Figure 2. In consequence, the

spring 17 is wound and if the pet-cock is re leased, the spring will immediately move it to the closed position as shown in the full lines in Figure 2. On the other hand, if, as the pet-cock is fully open, the gas coming through the pet-cock to the burner is ignited, the heat generated thereby would cause the thermostatic element 8 to move from the full position shown in Figure 1 to the dash and dot line shown in the same figure, in consequence bringing the toe 15 of the link 13 out of housing 10 into the path of the arm 19. See dash and dot position of arm 19 in Figure 3. In consequence the spring 17 cannot restore the arm 19 to its original full line position in said Figure 3 until the toe 15 is retracted into the housing 19, which can only take place when the thermostatic element 8 would move to the full line position in Figure 1 and this may only take place when the flame of the burner is extinguished.

Although the setting of the cut-off requires a full opening of the petcock when igniting the gas at the burner, any subsequent reduction or increase of the flame may be obtained Without interference from the cut-off due to the connection between the crank 22 and the arm 19 by means of the slidable engagement of the rod 21 with the yoke 20. It will also be noticed that when the gas is ignited at the burner, the heat so afiects the thermostatic element that the same is moved away from the flame so as to be the least affected by same and thereby its oxidation reduced to w a minimum.

I claim: 7

1. In combination with a gas burner pro vided with a cock controlling the flow of gas to the burner, means for moving the cock from open to closed position comprising, a V-- shaped thermostatic element at the burner having one end thereof hinged, a lever pivotally connected to the other end of said element, a spring actuated arm, a slidable con- 2o nection between the arm and the cock, a link operable by the lever and having means for engaging the arm when the cock is opened and the flame affects the V-shaped element.

2. In combination with a gas burner provided with a cock controlling the flow of gas to the burner, means for moving the cock from open to closed position comprising, a housing secured to the bottom of the burner, an inverted V-shaped thermostatic element i having one end pivotally secured to the housingand having the apex thereof locatedin heating relation to said burner, a lever pivotally mounted in the housing at one end, the other end of said lever being pivotally con- 25 nected to the other end of the V-shaped element, an arm pivoted to the housing and extending therefrom, a spring for actuating said arm, a slidable connection between said arm and said cook, a link connected to the housing and lever, said link having a toe operable to engage the arm when the cock is moved to the open position and said lever is actuated by the V-shaped element, the engagement of the toe with the arm preventing the spring from moving the arm to close the cock.

JAMES A. MALONEY. 

